[Solved]Exited with code -1073741819 when trying to create a new item by clicking on QGraphicsView.
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I am catching mouse click event in a class that inherits from QGraphicsView, as follow:
@
class CustomView : public QGraphicsView
{
public:
CustomView(QWidget*);
void setSceneManager (SceneManager*);
void draw();protected:
SceneManager* sceneManager;//Handle events. void mousePressEvent(QMouseEvent *event);};
@A class, SceneManager, can create new elements inside. The sort of elements that It can create is defined in an enum type, and the class method abailable to do that is:
@
void SceneManager::addItem(AvailableItems::ItemType t){
DrawableItem* item;
switch (t){
case (AvailableItems::neuro):
//Adding new neuron in view.
item = new DrawableItem(this->scene);
item->setFilePath(":/recursosimg/vecimg.svg");
listItems.append(item);
break;case (AvailableItems::connector): break; //TODO }}
@
This method is called from @ void mousePressEvent(QMouseEvent *event); @ in QGraphicsView subclass.
Debugger shows a Segmentation fault at following line, when clicking on QGraphicsView subclass object:
@
item = new DrawableItem(this->scene);
@
Detailed message is:"The inferior stopped because it received a signal from the operating system. Signal Name: SIGSEGV Signal Meaning: Segmentation fault".
Console shows " exited with code -1073741819" as well, when application is running from console, when clicking on the same area.I checked .dll libraries, i ve just one intallation of Qt5. I also tried with a new clean SO installation, and changing "{ }" blocks in switch statment:
@
case (AvailableItems::neuro):{
}
@With the same result. Any idea? Thank you
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Make sure that this->scene pointer is valid.
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Thank you for your fast reply.
I added qDebug mark:
@
void SceneManager::addItem(AvailableItems::ItemType t){
qDebug () << "Entering addItem";
qDebug () << (!this->scene ? "Null pointer" : "Ok");
DrawableItem* item;
switch (t){
case (AvailableItems::neuro):
//Adding new neuron in view.
item = new DrawableItem(this->scene);
item->setFilePath(":/recursosimg/vecimg.svg");
listItems.append(item);
break;case (AvailableItems::connector): break; //TODO }}
@
With result:
Entering addItem
Ok
And crash. So, I think its not null. It points to QGraphicsScene for the QGraphicsView.scene is declared as:
@
protected:
QGraphicsScene scene;
QList<Drawable> listItems;
};
@I ve noticed that there is an area where the applitaction never crashes if you click on. So, it works fine. Outside this area, it crashes.
GUI shows all the area that i want, but it seems like only a sub-area is detecting click. Well, all the area detects click event, but outside this sub-area, it crashes at the second line, so app only shows "Entering addItem".
@
qDebug () << "Entering addItem"; //Crash here when click outside the sub-area.
qDebug () << (!this->scene ? "Null pointer" : "Ok");
//Continue correclty when click on sub-area.
@This area is delimited with a visible border. Its not visible at design time with QtCreator. I ve promoted QGraphicsView with my inherit class CustomView.
----------------------- EDIT -----------------------------
I think I doing something wrong. In my CustomView class, I ve declared it as follow:
@
class CustomView : public QGraphicsView
{
public:
CustomView(QWidget*);
@In constructor method, I'm passing the own QGraphicsView object, as:
@
CustomView view(w.getGraphicsView());
@Where "w" is the MainWindow object, and getGraphicsView returns the QGraphicsView* object created by QtCreator that I want to manage. Now, I return the CustomView directly:
@
CustomView* view = w.getGraphicsView();
@Sorry for wasting your time.
